Portable power grinder



FIG. 1 is a front end, left side and top perspective of a portable power grinder, showing my new design;

FIG. 2 is a front end, right side and bottom perspective view thereof;

FIG. 3 is a rear end, left side and top perspective view thereof; and,

FIG. 4 is a rear end, right side and bottom perspective view thereof. 

The ornamental design for a portable power grinder, as shown. 